Age Calculator
International age, zodiac and more
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About this tool
Enter a date of birth and this tool instantly shows the international age, the calendar-year age, the traditional Korean counting age, days lived, zodiac animal, and days left until the next birthday. The international age has been Korea's official legal and administrative standard since June 2023.
How to use
- Enter the date of birth.
- International age, calendar-year age, and counting age are calculated instantly.
- Check the zodiac animal and the days left until the next birthday.
- Results update immediately whenever you change the date.
Frequently asked questions
- What is the difference between international age and calendar-year age?
- International age increases only after your birthday has passed, and has been Korea's official legal standard since June 2023. Calendar-year age is simply the current year minus your birth year, regardless of whether your birthday has passed, and is still used in a few Korean laws such as military service rules. Before your birthday, the two can differ by one year.
- Is the traditional Korean counting age still used?
- The counting age (age 1 at birth, everyone gains a year on January 1) has no legal effect anymore. Since June 2023 all contracts and official documents use international age. This calculator shows the counting age for reference only.
- How is age calculated before this year's birthday?
- If the birthday has not occurred yet this year, international age is (current year - birth year) minus one. For example, someone born in December 2000 checking in July would still be one year younger than the simple year subtraction.
- Is the zodiac animal based on the lunar calendar?
- No. The zodiac here is calculated from the birth year on the Gregorian calendar. People born before Lunar New Year are sometimes assigned the previous year's zodiac in traditional practice, which can differ from this result.
The date you enter is calculated entirely in your browser and is never sent to a server.